JPS58176829A - Breaker with resistor - Google Patents
Breaker with resistorInfo
- Publication number
- JPS58176829A JPS58176829A JP6008582A JP6008582A JPS58176829A JP S58176829 A JPS58176829 A JP S58176829A JP 6008582 A JP6008582 A JP 6008582A JP 6008582 A JP6008582 A JP 6008582A JP S58176829 A JPS58176829 A JP S58176829A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- main
- resistance
- resistor
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Circuit Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 本発明は、抵抗付しゃ断器に関するものである。[Detailed description of the invention] The present invention relates to a circuit breaker with a resistor.
しゃ断器において、しゃ断時に主接点と並列に抵抗を挿
入することにより、主接点に生じるしゃ油浸の再起電圧
の上昇率を下げ、しゃ断を容易にする方法が採られるこ
とがある。又、多くの接点を直列にした、多点しゃ断を
行う場合の各しゃ断点の電位分布を良好にするために、
主接点と並列に抵抗を入れる場合もある。さらに、地絡
しゃ断等の時、生じる過電圧を抑制するために、主接点
と並列に抵抗を挿入することもある。いずれにしてもこ
れらの抵抗は、主接点のしゃ断が完了した後は切卸しを
要するので、抵抗用の接点を設けなくてはならない。In a circuit breaker, a method is sometimes adopted in which a resistor is inserted in parallel with the main contact at the time of circuit breaker to reduce the rate of increase in the re-electromotive voltage due to oil immersion occurring at the main contact and facilitate circuit breaker. In addition, in order to improve the potential distribution at each breaking point when many contacts are connected in series and multi-point breaking is performed,
Sometimes a resistor is placed in parallel with the main contact. Furthermore, a resistor may be inserted in parallel with the main contact in order to suppress overvoltage that occurs in the event of a ground fault or the like. In any case, these resistors must be disconnected after the main contact has been cut off, so it is necessary to provide a contact for the resistor.
一方、無負荷の送電線を投入する時にも、大きな過電圧
を生じることがある。この再投入時の過電圧を抑制する
ためにはやはシ抵抗を用い主接点の投入前に１０ｍ５
程度、抵抗接点を閉じて抵抗を介して通電し１こ後、主
接点を投入することが行なわれることがある。On the other hand, large overvoltages may also occur when powering on an unloaded power transmission line. In order to suppress this overvoltage when the main contact is turned on again, a resistor of 10 m5 is used before the main contact is turned on.
In some cases, the resistive contact is closed and current is passed through the resistor, and then the main contact is turned on.
最近、高電圧化が進み、１ｏＯ万ボルトのような超々高
圧も実現されるようになると、しゃ断や投人時の過電圧
を抑制することが、機器や送電線路の経済設計のために
ますます重要になってきている。このため、主接点と一
定の時間差で動作する抵抗接点も、いよいよ信頼度の高
いものが要求されるようになってきている。Recently, as high voltages have progressed and ultra-high voltages such as 100,000 volts have become possible, suppressing overvoltage during cutoff and input is becoming increasingly important for the economical design of equipment and power transmission lines. It is becoming. For this reason, resistance contacts that operate with a fixed time difference from the main contacts are increasingly required to be highly reliable.
本発明は、かかる点に鑑み、適当な時間差動作が得られ
る信頼性の高い抵抗付しゃ断器を提供するものである。In view of this point, the present invention provides a highly reliable resistor-equipped circuit breaker that can obtain an appropriate time difference operation.
第１図ｆこ本発明の一実施例を示す、一般に、超々高圧
で用いられるしゃ断器は、多数の接点を直列にした多点
切構造とされている。この図は、多数のしゃ断点のうち
の一点のみを図示したものであシ、この図の左にも全く
同じ形のものが設けられ、しかもそういうユニットが２
個、８個と接続され４点、６点切となっている。第１図
において、（１）はフィンガ状の主固定接触子、（２）
は主可動接触子で、支持金具（３）と協動して室（４）
のガスを圧縮する。なお％ （Ｉｎ）と後述のく９）で
主接点（５）を構成している。（６）は主可動接触子（
２）と摺動し、支持金具（３）と固着されＴコフインガ
状の補助接触子、（７）は支持金具（３）に支承され図
示左右方向に移動自在なアーク可動接触子で、主可動接
触子（２）と一体になって移動し、主接点（５）よル連
れてアーク一定接触子（８）から開離する。 （１０は
支持金共（３）に枢着されたレバーで、リンク（ロ）を
介してアーク可動接触子（７）と連結されている。（ロ
）は操作機構（図示せず）で図示上下方向に駆動される
絶縁操作棒で、リンク（２）を介してレバーＱ［）と枢
着されている。α◆は支持金具（３）を支持した絶縁支
持台、（至）は接続導体、（ト）は主固定接触子（１）
と電気的に接続された抵抗器、Ｑηは抵抗固定接触子で
、支持金具（至）を介して抵抗器（至）と電気的に接続
されている。（６）は抵抗固定接触子＠を図示左方に押
圧したばね、ｉは主可動接触子（２）と固着された絶縁
ノズル、（ハ）は支持金具（３）と固着されたシリンダ
、（イ）はシリンダ（財）内を摺動可能なヒストン、（
２）はピストン勾に固着され抵抗固定接触子ａηと綴紐
する抵抗可動接触子で、シリンダシυ内と連通した通路
（２８ｍ）を有する。なお、（ロ）磐で抵抗接点（ハ）
を構成し、アーク接点（９）よシ遅く翻敵する。（２）
はシリンダ（財）に枢着されたラッチで、抵抗接点（ハ
）が閉成された位置で一端がピストン（２）と係合され
ている。（イ）はラッチに）を押圧しｔこばね、翰はピ
ストン（財）に設けられた逆止弁で、通路（２８ａ）の
図示左方へのみ開路される。（ハ）は一端がピストン（
イ）に固着されたストッパー、翰は一端がピストン（イ
）に固着されｆこばね、（７）はばねの他端に固着され
たばね受で、ストッパーに）の他端と当接している。ａ
］）は支持金具（３）に枢着されたレノ（−５に）はレ
バー６υの一端とばね受（７）とを連結したリンク、嗜
はラッチに）の他端とレバー０ηの一端とを連結したリ
ンクで、レバーｃｌυが図示の反時計方向番こ所定の角
度回動しＴこときレバー６υに固着されたビン（８８ａ
）と係合して連動するように構゛成されている。（財）
はレバー０υの他端とリンク（至）とを連結したリンク
で、（７）はフィンガ状の補助接触子である。FIG. 1f shows an embodiment of the present invention. Generally, a circuit breaker used at ultra-high pressure has a multi-point disconnection structure in which a large number of contacts are connected in series. This figure only shows one of the many breaking points, and there is also a unit of exactly the same shape on the left side of this figure, and there are two such units.
1, 8 are connected, and 4 and 6 points are disconnected. In Figure 1, (1) is a finger-shaped main fixed contact, (2)
is the main movable contact, which cooperates with the support fitting (3) to open the chamber (4).
compress the gas. Note that the main contact (5) is composed of % (In) and 9) described below. (6) is the main movable contact (
(2) is a T-shaped auxiliary contact that slides with the support metal fitting (3) and is fixed to the support metal fitting (3), and (7) is an arc movable contact that is supported on the support metal fitting (3) and can move freely in the horizontal direction shown in the figure. It moves together with the contact (2) and separates from the constant arc contact (8), taking the main contact (5) with it. (10 is a lever pivotally attached to the support plate (3), and is connected to the arc movable contact (7) via a link (B). (B) is an operating mechanism (not shown). It is an insulated operating rod that is driven in the vertical direction and is pivotally connected to the lever Q[) via a link (2). α◆ is the insulated support base that supported the support fitting (3), (to) is the connection conductor, (g) is the main fixed contact (1)
The resistor is electrically connected to the resistor, and Qη is a resistor fixed contact, which is electrically connected to the resistor through the support fitting. (6) is the spring that pressed the resistance fixed contact @ to the left in the figure, i is the insulating nozzle fixed to the main movable contact (2), (c) is the cylinder fixed to the support fitting (3), ( A) is a histone that can slide inside the cylinder, (
2) is a movable resistance contact fixed to the piston and connected to the fixed resistance contact aη, and has a passage (28 m) communicating with the inside of the cylinder cylinder υ. In addition, (b) Iwa is a resistance contact (c)
The arc contact (9) is slower than the arc contact (9). (2)
is a latch pivotally attached to the cylinder, and one end of which is engaged with the piston (2) when the resistance contact (c) is in the closed position. (A) is a check valve provided on the piston, which opens the passage (28a) only to the left in the figure. In (c), one end is a piston (
One end of the stopper fixed to the piston (A) is a spring, and (7) is a spring receiver fixed to the other end of the spring, which is in contact with the other end of the stopper. a
]) is a link connecting one end of the lever 6υ and the spring holder (7), and the other end of the lever 0η is connected to the other end of the lever 0η. The lever clυ is rotated by a predetermined angle in the counterclockwise direction shown in the figure, and the bottle (88a) fixed to the lever 6υ is
) is configured to engage and operate in conjunction with. (Foundation)
is a link connecting the other end of the lever 0υ and the link (to), and (7) is a finger-shaped auxiliary contact.
第１図は、しゃ断器か閉成された状態であり、電流は接
続導体α荀→主固定接触子（１）→主可動接触子（２）
→補助接触子（６）→支持金具（３）と流れて、左のユ
ニットへと流れている。In Figure 1, the breaker is closed, and the current flows from the connecting conductor α → main fixed contact (1) → main movable contact (2).
→ Auxiliary contact (6) → Support metal fitting (3) and then flows to the left unit.
第１図の状態でしゃ断指令が入ると操作機構が鋤いて、
これに連なる絶縁操作棒（６）が下方に引張られる。そ
のため、レバーａｑａυが反時計方向に回り、リンクａ
υによシ主可動接触子（２）を左に動かす。When a cutoff command is received in the state shown in Figure 1, the operating mechanism plows.
The insulated operating rod (6) connected thereto is pulled downward. Therefore, the lever aqaυ turns counterclockwise, and the link a
Move the main movable contact (2) to the left by υ.
この時、まず、主可動接触子（２）は主固定接触子（１
）から離れ、次に主可動接触子（２）と一体に動くアー
ク可動接触子（７）とアーク固定接触子（８）が開く。At this time, first, the main movable contact (2) is switched to the main fixed contact (1).
), then the arc movable contact (7) and the arc fixed contact (8), which move together with the main movable contact (2), open.
その時、これらの間にアークが発生するが室（４）のガ
スが圧縮されて高圧となシ、ノズル（イ）中を流れてア
ークを吹き消して電流をしゃ断し主接点（５）でのしゃ
断か完了する。−万抵抗接点（ハ）の可動接触子（至）
と一体のビス・トンに）は、ラッチ（ホ）が係合してい
るため、最初は動かない、従って、レバー（ロ）が、リ
ンク■の＃ｊＪきとともに反時計方向に回ると、リンク
（至）を介してばね受は曽か左に動（ので、ばね翰が引
き伸ばされて蓄勢する。そして、し／（−■が所定の角
度回動してビン（Ｈａ）がリンクＱと係止して、リンク
（至）が左にｍｓ出し、ラッチに）がまさに外れようと
する。これが、第２図である。この時点は、抵抗接点（
財）でのしゃ断が主接点（５）でのしゃ断機、２５ｍ８
程度の必要な抵抗挿入時開に適合するように、ビン
（８８ａ）とリンク（２）との係止を調整して、決める
ことかできる。その後ラッチに）が外れ、可動接触子（
４）が左へ動いて行くと、初めは固定接触子ａηかばね
α場により可動接触子に）に追従して動き、支持金具Ｑ
９のストッパ部に当って止まる。この時、抵抗電流は接
触子Ｑη（２）間にアークを発生するが、シリンダー（
２１ａ ）ガス圧力がピストン（２）の動きによシ下っ
ているので、通路（２８ａ）を通してガスが流れ、アー
クのしゃ断を容易にして抵抗電流をしゃ断する。この時
、逆止弁勾のためにシリンダ（２１ａ）内へはピストン
働からのガスのゐ入は阻止される。At that time, an arc is generated between these, but the gas in the chamber (4) is compressed and becomes high pressure, which flows through the nozzle (A) and blows out the arc, cutting off the current and causing the main contact (5) to flow. Shut down or complete. −Movable contact (to) of million resistance contact (c)
The latch (E) is engaged, so the screw (T) that is integrated with (to), the spring holder moves to the left (so the spring holder is stretched and stores the force. Then, shi/(-■ rotates at a predetermined angle and the bottle (Ha) connects with the link Q. After locking, the link (to) moves to the left for ms, and the latch (to) is about to release. This is shown in Figure 2. At this point, the resistance contact (
A breaker whose main contact (5) is the breaker, 25m8
The engagement between the bottle (88a) and the link (2) can be adjusted and determined to suit the degree of resistance required for opening upon insertion. Then the latch) is released and the movable contact (
4) moves to the left, the fixed contact aη initially moves following the movable contact () due to the spring α field, and the support bracket Q
It stops when it hits the stopper part 9. At this time, the resistance current generates an arc between the contactor Qη(2), but the cylinder (
21a) Since the gas pressure is lowered by the movement of the piston (2), gas flows through the passageway (28a), facilitating the interruption of the arc and interrupting the resistive current. At this time, the check valve slope prevents gas from entering the cylinder (21a) from the piston action.
こうして、各接点（５Ｊ （９）−が開離した状態を第
８図に示す。第８図の弗醸された状態から、投入状態に
至る過程を次に説明する。しゃ断器に投入指令カ入ると
、操作棒＠か上方に動いてレバーｃｏ ａｕが時計方向
に回動する。このため、抵抗’６Ｊ １ｔＪＪ接触子（
ハ）及び主可動接触子（２）が右方に動いていく。抵抗
可動接触子−はストッパ曽かピストン磐から出ているの
で、初めからリンクに）の動きとともに右へ動く、抵抗
固定接触子＠はばね０１によシ押し出されているので、
先ず、抵抗接点（ハ）か閉じて抵抗か操入され、ついで
アーク接点（９）が蘭じて最後に主接点（５）が閉じる
。これまでの抵抗挿入時間は、例えば１０ｍ８ など
Ｉこ選ばれる。そして、最後に主可動接触子（２）と主
固定接触子（１）とが閉じ１通ｌ［ｋ流が主にこの部分
を流れるようになシ、役人動作を完了し、第１図の状態
に戻る。この動作の間、逆止弁（ハ）は開いてピストン
（２）の前面のガス圧が投入動作のさまたげにならない
ようにしている。The state in which each contact (5J (9)-) is opened is shown in FIG. 8. The process from the saturated state shown in FIG. When it enters, the operating rod @ moves upward and the lever co au rotates clockwise.For this reason, the resistance '6J 1tJJ contact (
c) and the main movable contact (2) move to the right. The movable resistance contact comes out from the stopper or the piston, so it moves to the right with the movement of the link from the beginning.The fixed resistance contact @ is pushed out by the spring 01, so
First, the resistance contact (c) is closed and the resistance is operated, then the arc contact (9) is closed, and finally the main contact (5) is closed. The resistance insertion time so far has been selected to be 1, for example 10m8. Finally, the main movable contact (2) and the main stationary contact (1) are closed so that the flow mainly flows through this part, completing the official operation, as shown in Figure 1. Return to state. During this operation, the check valve (c) is opened to prevent the gas pressure in front of the piston (2) from interfering with the closing operation.
このように本発明によれば簡単な構造でしゃ断時に抵抗
接点の開く時点を主接点の開いた点から必要なだけ正確
に遅らせることができ、投入時にも必要なだけ抵抗接点
の投入時間を早くすることができる０例えば、しゃ断時
に抵抗挿入時間を２６ｍ５位にしようとすると、しゃ断
性能を上げるため主接点の曲楡速度を大きくシ１コとき
など、主接点の動作行程の殆んど最終に近い点で抵抗接
点を開かなくてはならない。しかし、ばねに）にカが蓄
えられているので、操作棒（ロ）のａきがほとんどなく
なっ１こ後でも、抵抗接点をばね（２）の力によシ曲＜
ことができる。As described above, according to the present invention, with a simple structure, it is possible to accurately delay the opening point of the resistance contact at the time of cut-off from the point at which the main contact opens, and to make the closing time of the resistance contact as early as necessary at the time of closing. For example, if you try to increase the resistance insertion time to about 26 m5 at the time of disconnection, you will need to increase the bending speed of the main contact to improve the disconnection performance, which will occur almost at the end of the main contact's operation stroke. The resistive contact must be opened at a nearby point. However, since the force is stored in the spring (2), the resistance contact is bent by the force of the spring (2) even after the operation rod (B) has almost no force.
be able to.
ばね翰は、第１図の投入状態では殆んど荷重が加わらな
い状態としておき、主可動接触子（２）の動作途中から
大きな荷重が働く状態にセットしておくことが可能であ
り、抵抗可動接触子（２）を動かすためのばね翰の蓄勢
力はしゃ断行程の途中から大となり、しゃ断動作初期の
主接点部動用に大きな力の必要な時点では小さくして、
主接点の動作への影響を小さくするのがよい。さらに、
ばね翰は投入状態では抵抗可動接触子（２）が閉じる方
向に力を与えるように（第１図ではばね翰が圧縮された
状態に）して、しゃ断器の動作初期に主可動接触子（２
）の動作力を助けるようにすることもできる。The spring wire can be set in a state where almost no load is applied in the closed state shown in Figure 1, and can be set in a state where a large load is applied from the middle of the operation of the main movable contact (2). The stored force of the spring wire for moving the movable contactor (2) increases from the middle of the breaking stroke, and decreases at the time when a large force is required to move the main contact at the beginning of the breaking operation.
It is better to minimize the influence on the operation of the main contacts. moreover,
When the spring wire is closed, it applies a force in the direction of closing the resistance movable contact (2) (the spring wire is in a compressed state in Figure 1). 2
) can also be made to help the movement force.
そして、しゃ断動作が進み、主５Ｊ＃ＬＩｌ接触子（２
）の加速力が殆んど不要となった点で、ばね翰は抵抗可
動接触子−を開く方向に力を蓄勢するように（第１図で
はばね翰を引張シ状態に）することもできる。このよう
にすれば、しゃ断動作時に必要な操作機構の駆動力のピ
ークを小さくすることができ、機橘各部が小形１Ｍｍ化
されるなどの利点が得られる。Then, the cutting operation progresses, and the main 5J#LIl contact (2
), the acceleration force of ) is almost no longer necessary, and the spring wire can store force in the direction of opening the resistance movable contact (in Figure 1, the spring wire is in the tension state). can. In this way, it is possible to reduce the peak of the driving force of the operating mechanism required during the cut-off operation, and there are advantages such as the size of each part of the machine can be reduced to 1 mm.
上記実施例では、しゃ断時にばね翰が蓄勢されるとき、
抵抗可動接触子−の動きをある時点まで止めるラッチに
）を用いているが、レバーおよびリンク機構部の構造に
よシ、抵抗接点の動きを初期は主接点に比べてできるだ
け遅くなるようにし、抵抗可動接触子の重置を大きくし
て憧性を大にすることによりラッチ（イ）を無くしても
、抵抗接点のＮ１１ｌｔ時間を主接点に対して十分遅ら
せることができる。In the above embodiment, when the spring wire is charged at the time of interruption,
() is used as a latch to stop the movement of the resistance movable contact until a certain point, but due to the structure of the lever and link mechanism, the movement of the resistance contact is initially made to be as slow as possible compared to the main contact. Even if the latch (A) is eliminated, the N11lt time of the resistive contact can be sufficiently delayed with respect to the main contact by increasing the overlap of the movable resistive contacts to increase the attractiveness.
第１図は本発明の一実施例を示す断面図で、閉成された
状態を示す。第２図および第８図は第１図のそれぞれし
ゃ断途中の状態およびしゃ断完了の状態を示す説明図で
ある。
図において、（５）・・・主接点％（９）・・・アーク
接点、 ０４・・・抵抗器、（ハ）・・・抵抗接点、に
）・・・ラッチである。
なお各図中同一符号は同−又は相当部分を示す。
代理人 葛野信−
！−一７戸FIG. 1 is a sectional view showing one embodiment of the present invention, showing the closed state. FIG. 2 and FIG. 8 are explanatory diagrams showing the state of FIG. 1 in the middle of shutoff and the state of completion of shutoff, respectively. In the figure, (5)...main contact %(9)...arc contact, 04...resistor, (c)...resistance contact, ni)...latch. Note that the same reference numerals in each figure indicate the same or equivalent parts. Agent Shin Kuzuno! -17 houses
Claims (3)
続し、上記主接点が開離してから上記抵抗接点が開離す
るものにおいて、上記主接点が開離されるとき上記抵抗
接点と連結したばねを蓄勢し、上記主接点が所定の距離
開離して上記ばねを放勢して上記抵抗接点を開離するよ
うにしたことを特徴とする抵抗付しゃ断器。(1) In a system in which a series circuit of a resistor and a resistance contact is connected in parallel to a main contact, and the resistance contact is opened after the main contact is opened, when the main contact is opened, the resistance contact A circuit breaker with a resistance, characterized in that a connected spring is energized, the main contact is opened a predetermined distance, the spring is released, and the resistance contact is opened.
点と連動したラッチが外されて放勢することを特徴とす
る特許請求の範囲第１項記載の抵抗付しゃ断器。(2) The circuit breaker with a resistor according to claim 1, wherein the spring releases its force when the main contacts are separated by a predetermined distance, as a latch interlocked with the main contacts is released.
る方向に蓄勢されることを特徴とする特許請求の範囲第
１項記載の抵抗付しゃ断器。(3) A circuit breaker with a resistance according to claim 1, wherein the spring is biased in a direction in which the resistance contact is closed when the main contact is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6008582A JPS58176829A (en) | 1982-04-08 | 1982-04-08 | Breaker with resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6008582A JPS58176829A (en) | 1982-04-08 | 1982-04-08 | Breaker with resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58176829A true JPS58176829A (en) | 1983-10-17 |
| JPH0354408B2 JPH0354408B2 (en) | 1991-08-20 |
Family
ID=13131888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6008582A Granted JPS58176829A (en) | 1982-04-08 | 1982-04-08 | Breaker with resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58176829A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4987297A (en) * | 1988-03-14 | 1991-01-22 | Gaz De France | Method and apparatus for automatically reading a mechanical fluid meter |
| CN103903884A (en) * | 2014-03-10 | 2014-07-02 | 广东电网公司电力科学研究院 | Totally-closed anti-arc-pulling protecting switch |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0523684Y2 (en) * | 1989-12-06 | 1993-06-17 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS432164Y1 (en) * | 1965-03-31 | 1968-01-30 |
-
1982
- 1982-04-08 JP JP6008582A patent/JPS58176829A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS432164Y1 (en) * | 1965-03-31 | 1968-01-30 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4987297A (en) * | 1988-03-14 | 1991-01-22 | Gaz De France | Method and apparatus for automatically reading a mechanical fluid meter |
| CN103903884A (en) * | 2014-03-10 | 2014-07-02 | 广东电网公司电力科学研究院 | Totally-closed anti-arc-pulling protecting switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0354408B2 (en) | 1991-08-20 |
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